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*To*: tesla-at-pupman-dot-com*Subject*: Re: Sphere/Toroid Comparison Chart*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Tue, 08 May 2001 18:01:01 -0600*Resent-Date*: Tue, 8 May 2001 18:13:25 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <sBMPK.A.aBF.YuI-6-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Luc by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ludev-at-videotron.ca> Hi guy I post again the same question: If you look at the chart you'll see that until you hit 18" of exterior diameter the toroid with a thickness of 4" have more capacity than one of 6" thickness. Please could some of you explain to me how a toroid with an area bigger could have a smaller capacity. I already know that the surface facing the center ( the hole of the donut ) don't participated as far as the exterior. But the exterior of a 6" thick toroid is bigger than the area of a 4" one. Tx Luc Benard Tesla list wrote: > > Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-uswest-dot-net>" <k.schraner-at-datacomm.ch> > > John C., Matt D., Terry- > > John, your posting has made me to take another look at the table, Matt > D. has posted Thursday, May 03, 2001. I need to point to two facts, in > case, somebody likes to make use of this table. In any case, however, > beeing it a toroid or a sphere in TC use, I would rather prefer, to make > the E-Tesla6 calculation. The 2 facts are: > > 1.) Error here, in definition of diameter: NOT center-center, but > outer (maximal) diameter of toroid!!! (plausibility: Bert P.'s Eqn.) > | > V > > C-C Chord Nom. > > Toroid Toroid Cap Equiv.Diam. Equiv.Diam. > > d1(inches) d2(inches) pf sphere (in.) sphere (m) > > > > 8 4.00 7.723 5.47 0.1390 > > 8 6.00 4.540 3.22 0.0817 not feasible > > 10 4.00 10.675 7.56 0.1921 > > 10 6.00 8.243 5.84 0.1484 not feasible > > 12 4.00 13.262 9.40 0.2387 > > 12 6.00 11.585 8.21 0.2085 > > 14 4.00 15.574 11.04 0.2803 > > 14 6.00 14.605 10.35 0.2629 > > 16 4.00 17.675 12.53 0.3181 > > 16 6.00 17.359 12.30 0.3125 > > 18 4.00 19.607 13.89 0.3529 > > 18 6.00 19.893 14.10 0.3581 > > 20 4.00 21.402 15.17 0.3852 > > 20 6.00 22.245 15.76 0.4004 > > 22 4.00 23.083 16.36 0.4155 > > 22 6.00 24.444 17.32 0.4400 > > 24 4.00 24.668 17.48 0.4440 > > 24 6.00 26.512 18.79 0.4772 > > 26 4.00 26.170 18.55 0.4711 > > 26 6.00 28.469 20.18 0.5124 > > 28 4.00 27.601 19.56 0.4968 > > 28 6.00 30.329 21.49 0.5459 > > 30 4.00 28.969 20.53 0.5214 > > 30 6.00 32.103 22.75 0.5779 > > 2.) John, I was not able to find a satisfactory way, using the equations > I find on your website, to represent the above table (trying quite a > number of some possible input data errors about C-C vs. outer d1). > > Cheers > Kurt Schraner > > Tesla list wrote: > > > > Original poster: "John H. Couture by way of Terry Fritz > <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net> > > > > The overlap is not a problem with the Toroid Capacitance Graph I show in the > > Tesla Coil Notebook because I did not use Bert Pool's equation. The > > equations I used are shown on my web site. Look for Secondary Terminal at > > > > http://home.att-dot-net/~couturejh/ > > > > John Couture > > > > ----------------------------- > > > > -----Original Message----- > > From: Tesla list [mailto:tesla-at-pupman-dot-com] > > Sent: Sunday, May 06, 2001 9:04 AM > > To: tesla-at-pupman-dot-com > > Subject: Re: Sphere/Toroid Comparison Chart > > > > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" > > <Mddeming-at-aol-dot-com> > > > > In a message dated 5/5/01 2:52:15 PM Eastern Daylight Time, tesla-at-pupman-dot-com > > writes: > > > > > > > > Original poster: "Barton B. Anderson by way of Terry Fritz < > > > twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net> > > > > > > Hi Matt, > > > > > > The toroid C value is obviously calc'd in these (standard toroid > > > equations) as well > > > as the spheres. But there is a problem with some. Toroid cord and > > > diameters overlap > > > on some which is impossible and the equation is then wrong for those > > > toroids (and > > > also wrong for the equiv. spheres). For example, the 8" x 6" toroid. The > > > cord is 6", > > > and therefore the outer diameter must be larger than 12". This is why the > > > capacitance > > > is way off on these particular impossible toroids. > > > > > > Take care, > > > Bart A. > > > > Hi Bart! > > Thanks for pointing out the impossibilities. The table was generated for a > > range of sizes, and since I was not trying to build an impossible size, I > > guess I overlooked the silliness at the lower (upper) end of the chart. > > Since some people are talking about metallic "garden spheres" in lieu of > > toroids, I thought a quick comparison might help. > > With egg on face, > > Matt D.

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